Why is Kansas more Democratic than Nebraska?

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I have noticed that since 1960 the Democratic candidates have been producing better results in Kansas than in Nebraska (with only one exception).
Why do you think this is?
And what happened in 2008?

2012 [2008 2004 2000 1996 1992 1988 1984 1980 1976 1972 1968 1964 1960

Nebraska 38.03 41.60 32.68 33.25 34.95 29.40 39.20 28.81 26.04 38.46 29.498    31.81 52.61 37.93

Kansas 38.05 41.55] 36.62 37.24 36.08 33.74 42.56 32.60 33.29 44.94 29.504 34.72 54.09 39.10

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Perhaps increased Democratic turnout in urban areas accounts for why Nebraska was more Democratic than Kansas in 2008. NE-02, the one congressional district that President Obama won in the state, included Omaha.

Does anyone know if Obama canvassed in NE-02?
Who was the last Democrat anyway to campaign in Nebraska (after the primary season)?